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Environmentally sustainable route to SiO2@Au–Ag nanocomposites for biomedical and catalytic applications

机译：生产生物医学和催化应用的SiO2 @ Au-Ag纳米复合材料的环境可持续途径

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A facile, sustainable, operationally simple and mild method for the synthesis of SiO _(2) @Au–Ag nanocomposites (NCs) using Nephrolepis cordifolia tuber extract is described and its catalytic, antibacterial and cytotoxic properties were investigated. The fabricated SiO _(2) @Au–Ag NCs were well characterized by UV-visible spectroscopy, transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), Fourier transform infrared (FT-IR) spectroscopy, powder X-ray diffraction (XRD), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) to determine the optical activity, size and morphology, elemental composition, functional groups present, crystallinity, thermal stability and chemical state respectively. The obtained SiO _(2) @Au–Ag NCs exhibited spherical shape SiO _(2) decorated with Au and Ag nanoparticles. The diameter of the SiO _(2) nanoparticles ranges from 200–246 with average 3 nm diameter of Au and Ag NPs. Synthetic utility of this protocol has been demonstrated by exploring its effective catalytic activities for the solvent-free amidation of carboxylic acid with a primary amine with excellent yields. Moreover, the synthesized nanocomposite exhibited as noticeable antibacterial effect against Gram negative and Gram positive bacteria and better bio-compatibility against human keratinocytes. Thus, additive free SiO _(2) @Au–Ag NCs display the potential for catalysis and biomedical applications.
机译：一种简便，可持续，操作简单，温和的方法，使用山葵肾提取物合成SiO _（2）@ Au–Ag纳米复合材料（NCs），并研究了其催化，抗菌和细胞毒性特性。制备的SiO _（2）@ Au–Ag NCs通过紫外可见光谱，透射电子显微镜（TEM），能量色散X射线（EDX），傅立叶变换红外（FT-IR）光谱，粉末X表征良好射线衍射（XRD），热重分析（TGA）和X射线光电子能谱（XPS）分别测定旋光性，大小和形态，元素组成，存在的官能团，结晶度，热稳定性和化学状态。获得的SiO _（2）@ Au–Ag NCs表现出装饰有金和银纳米粒子的球形SiO _（2）。 SiO _（2）纳米颗粒的直径范围为200-246，Au和Ag NP的平均直径为3 nm。通过探索其对羧酸与伯胺的无溶剂酰胺化的有效催化活性，可以证明该方案的合成实用性，并具有优异的收率。而且，合成的纳米复合材料表现出对革兰氏阴性和革兰氏阳性细菌的显着抗菌作用以及对人角质形成细胞的更好的生物相容性。因此，无添加剂SiO _（2）@ Au–Ag NCs显示出催化和生物医学应用的潜力。

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